Yarn stop motion for twisting machines



. 2, 1930. c. AVEYARD YARN STOP MOTION FOR TWISTING MACHINES Filed March 7, 1929 I a w H WM 4u x2 5 m M a a I N w 5\ F 6 INVENTOR.

pf ATTORNEYS 7 Patented Dec. 2, 1930 IT ATE i i if 83,897

PA ENT OFFICE f CHARLES AVEXARID, OF OWELL," ASSAC USETTS; AssIGNon TO HWHITIN aoH nE WORKS, or- WHITIYNSVILLE, MAssA'cHUsETTsa conronA'rroN or MASSACHUSETTS YARNfsT'OP norionron zrwis'rme MACHINES Application filed- March 7,

This invention relates to a stop motion for use in a ,machine'in which two strands of yarn are twisted together toform a double thread. When either strand" of yarn is broken in such a machine, the vremaini'r gg;strand may continue to twist, producing a single strand thread ifthe breakage is not immediately noted by the operator.

.It is the object of myinvention to provide improved stopping devices for breaking and clamping the second strand first strand is broken.

A further object is to provide a device of this character whichdoes not engage. the yarn strands until after breakage ofi one of the strands has occurred. I I I have also provided means for rendering the entire assembly ,of stop motion devices inoperative when the-machine'is brought to rest, thereby avoiding yarn breakage when the machine is again started in operation. I

My invention further relates to; arrangements and combinations of parts which will Ice-hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawingsin which a Fig. 1 isa sectional side elevation of parts of a twisting machine embodying my im-. provements; I v

Fig. 2 is anenlarged sectional side elevation of the stop motion device;

Fig. 3 is a view similar to Fig. 2 but show ing'the parts ma difierent position;

Fig. 4 is a detail sectional. plan view, taken 7 substantially along the line 44 in Fig. 1;

Fig. 5 is a ingmeinbers; a

Fig. 6 is an end elevation thereof, looking in the direction of. the arrow 6 in Fig. 5 and Fig. 7 is a detail sectional plan view of certain parts, taken along the line 77 in Fig.3. Referring particularly to Fig. l, I have shown parts of a twisting machineincluding ring 10 mounted onaring railll and surrounding bobbin B on! which. the twisted plan view of one ofthe clampthread Tis wound. The thread'is formed by twisting together twostrands. of yarn Y, drawn'from spools mounted-on acreel 14 abovethe twisting machanisin.

of yarn when a' 1929. seriai'm. 345,075.

' Two strands of yarn Y-aredrawn downward arounda guide wire 15, from which they are drawn forward and around atop roll 16 and feed roll 17, the latter roll being positively rotated and the top roll 16 resting freely thereon.

V Thethread T passes downward from the roll 17 through a guide wire 18 to a'traveller 19 on the ring 10 and thence to the bobbin B.

The parts thus far described are of the usualcommercial type and in themselves form no'partof my present invention.

. Arod 20 is supported in brackets 21 on the the end of a bushing 33, which in turn is clamped against the side of the arm 24.

v The member is preferably formed of sheet metal and the construction thereof is best shown in Figs. 5 and 6.. Each member 30 comprises a supporting end portion having a segmental slot or opening 36 therein, and a laterally projecting or yarn clamping portion 37 having a straight slot 38 communicating withthe segmental slot 36 but preferably of slightly less width. The clamping screw 32 maybe held firmlyin position in the end of the'arm 24'by an additional clamping screw 39 extending through a split end portion of the arm 24.

A member 40 is loosely pivoted on the bushing 33, any wear or undesirable looseness between the parts being taken up by a clamping screw 42. The member 40 is provided with a segmental-counterweight portion 44, in which a second clamping memher or bar 45 is firmly secured. The bar 45 is positioned to swing freely in the segmental slot 36 and to enter the slot 38 of the fixed clamping member 30 when the bar 45 moves downward to clamping position.

The sides of the member'45 are preferably slightly inclined or wedgeshaped, as clearly indicated in Fig. 2, and the width of the member at its widest portion is substantially equal to the width of the slot 38.

A wire is secured in an olfset'portion 51 of the member 40 and is provided with a porcelain thread guide 52 at its lower end.

The parts of my invention thus far described operate as follows The clamping members are so positioned that the yarn strands Y travelling from the guide wires 15 to the top rolls 16 pass freely between the portion 37 of the fixed clamping member 30 and the movable clamping membcr or bar 45, as indicated in Fig. 9.. Each clamping bar i5 is held in this spaced relation by its porcelain guide 52, which rests upon the thread T below the feed roll 17, as indicated in Fig. 1.

If one of the strands of yarn Y is broken, the remaining strand will twist single and the thread thus formed will be too light to sustain the combined weight of the guide 52, wire 50 and counterweight l i, which parts will swing downward to the position indicated in Fig. 3.

The remaining strand of yarn Y will thus I be clamped between the edges of the slot 38 and the tapered sides of the bar 45, which clamping will cause the yarn to be promptly broken, with the end of the yarn clamped and held by the stopping device. The production of single thread is thus effectively prevented.

The stop motion as thus far described operates satisfactorily during the normal running of the machine. It is found, however, that when the machine is stopped, all of the stop motion devices tend to move downward to the position indicated in Fig. 3, and that when the machine is thereafter started in operation, many of the threads or yarn threads will be broken before the tension on the threads T is suflicient to raise the guides 52 and release the yarn strands from the clamping bars To prevent such breakage upon starting the machine, I provide a rod extending lengthwise of the machine and provided with arms 61 supporting additional rods 62, also extending lengthwise of the machine and directly behind the wires 50.

' One of the arms 61 is provided with a bracket 6 1 (F 2 and 3) which is connected by a link 65 (Fig. l) to one end of an arm 66 secured on an upright shaft 67.

The shaft 67 is part of the regular stopping and starting mechanism of the machine and is provided with a starting handle 68 in its upper portion and with an arm 69 at its lower end, having a pin and slot connection with an arm 70 on a longitudinally movable shipper rod 71. The construction shown and described is for the left hand side of the machine, as viewed in Fig. 1, and the corresponding parts at the right hand side of the machine are connected through a second link 65 (Fig. 4) with a second arm 66 projecting in the opposite direction from the shaft 67.

hen the shipper handle 68 is moved in the direction of the arrow at in Fig. 4, to running position, the arms 61 will be drawn toward the center of the machine and the rods 62 will be moved out of the path of the wires 50, as indicated in Fig. 3, leaving the stopping devices free to act.

lVhen the handle 68 is moved in the opposite direction to stop the machine, the arms 61 will be swung outward, as indicated in Fig. 52, causing the rod 62 to lift the Wires 50 and move the clamping bars 45 to inoperative or raised position, where they will be held until after the machine has been again started in operation. The bars 45 will not be fully released until the shipper handle has been thrown to full driving position.

It will thus be apparent that I have provided a very simple device for clamping a single yarn strand and breaking and holding the same whenever its associated strand is broken. The device is similarly effective for clamping both strands if the thread T is broken below the feed roll 17.

I have also provided means by which the stopping devices are automatically rendered inoperative, as the machine is brought to rest, and by which they are held inoperative until the machine is approaching full speed operation.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is 1. In a twisting machine, a member having spaced yarn clamping portions, a clamping bar, said member and bar being mounted for relative movement toward and away from each other, and one thereof being provided with thread engaging means effective to hold said member and bar in spaced relation during the normal operation of the machine, and means to move said bar between said spaced portions to clamp the yarn. upon thread breakage, said clamping bar being wedge-shaped in cross section and having its lower edge portion of less width than the distance between the clamping portions of said member.

2. The combination in a twisting machine as set forth in claim 1, in which the upper edge portion of said bar fits closely between said clamping portions.

3. In a twisting machine, a supporting bar, an arm angularly adjustable thereon, a

slotted plate secured for angular adjust ment on said arm, a yarn clamping bar movable into the slot of said plate to clamp the yarn, a supporting member for said clamping bar, said member being pivoted on said arm, and a thread-engaging device mounted on said member and movable therewith, said 'ing said clamping bar in spaced relation to said slotted plate during normal operation of the machine.

4. The combination in a twisting machine as set forth in claim 3, in which the supporting member has a counterweight portion effective to increase the clamping action of saidbar. I 'i Y 5. In a twisting machine, a plurality of fixed yarn clamping members, a plurality of movable yarn clamping members, threadengaging means to hold said parts in spaced relation during normal operation of the ma chine, said movable members being separately movable to yarn clamping position upon thread breakage, and means to stop the machine and effective to separate all of said fixed and movablemembers when the machine is stopped. i

6. I11 a twistingmachine', a plurality of fixed yarn clamping members, a plurality of movable yarn clamping members, threadengaging means to hold said parts in spaced relation during normal operation of the machine, said movable members being separately movable to yarn clamping position upon thread breakage, stopping mechanism for said machine, and means op'eratively fconnected to said stopping mechanism and mov- Yr able thereby to separate all of said yarn- Y clamping parts when the machine is stopped.

7. In a twisting machine a plurality of fixed yarn clamping members, a plurality of movable yarn clamping members, threadengaging means to hold said parts in spaced ing spaced yarn clamping portions, a clampmg bar pivoted to said rodfor movement into and out of clampingengagement with said spaced yarn clamping portions, said bar having a counterweight'ed portion efi'ective to move the bar toward said clamping portions and having a structurally'integral yarn engaging portion effective to maintain said counterweight and clamping bar out of clamping position during normal operation of the machine. a

In testimony whereof I have hereunto affixed my signature.

CHARLES AVEYARD.

device engaging the thread and thereby hold- 

